dmaengine: shdma: add DMA_PREP_ACTUAL_COUNT support

This patch adds support for DMA_PREP_ACTUAL_COUNT. And then, the
driver can send acutal length in a transaction to a dma slave driver.

Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
(cherry picked from commit 2308e06ebb832d40b1a74d94435a859ccc27ec48)
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>
1 file changed